简介:AbstractThetemporaldevelopmentofasinglemodeRayleigh-Taylorinstabilityconsistsofthreestages:thelinear,freefallandterminalvelocityregimes.Thepurposeofthispaperistoreportonnewphenomenaobservedintheapproachtoterminalvelocity.Ournumericalstudyshowsanunexpectednonuniformapproachtoterminalvelocity.Thenonuniformityappliesespeciallytothespikes,whicharefingersofheavyfluidfallingintothelightfluid,butitalsoappliestotherisingbubblesoflightfluid.ForspikesespeciallyourresultscallintoquestionthemeaningfulnessofaterminalvelocityformoderatevaluesoftheAtwoodnumberA.Afterashorttimeperiodofpseudo-terminalplateau,thespikevelocityincreasestoasignificantlyhighermaximum,followedbyadecrease.Thisphenomenaappearstobeduetoaslowevolutionintheshapeofthespikeandbubble.Wefindarelationbetweenthespike(bubble)accelerationandthetipcurvature.Incorrelationwithanincreaseinthespikevelocity,th
简介:Inthispaper,wefirstdeterminetherelationsamongthebestboundsAandBoftheg-frame,theg-frameoperatorSandthepre-frameoperatorQandgiveanecessaryandsufficientconditionforag-framewithboundsAandBinacomplexHilbertspace.Wealsointroducethedefinitionofag-framesequenceandobtainanecessaryandsufficientconditionforag-framesequencewithboundsAandBinacomplexHilbertspace.Lastly,weconsiderthestabilityofag-framesequenceforacomplexHilbertspaceunderperturbation.
简介:A(k;g)-graphisak-regulargraphwithgirthg.A(k;g)-cageisa(k;g)-graphwiththeleastpossiblenumberofvertices.Letf(k;g)denotethenumberofverticesina(k;g)-cage.Thegirthpairofagraphgivesthelengthofashortestoddandashortestevencycle.Afc-regulargraphwithgirthpair(g,h)iscalleda(k;g,h)-graph.A(k;g,h)-cageisa(k;g,h)-graphwiththeleastpossiblenumberofvertices.Letf(k;g,h)denotethenumberofverticesina(k;g,h)-cage.Inthispaper,weprovethefollowingstrictinequalityf(k;h-1,h)
简介:In[1],ShenGuangyuconstructedseveralclassesofnewsimpleLiealgebrasofcharacteristic2,whicharecalledthevariationsofG2.Inthispaper,theauthorsinvestigatetheirderivationalgebras.ItisshownthatG2anditsvariationsallpossessuniquenondegenerateassociativeforms.TheauthorsalsofindsomenonsingularderivationsofViGfori=3,4,5,6,andtherebyconstructsomeleft-symmetricstructuresonViGfori=3,4,5,6.Someerrorsaboutthevariationsofsi(3,F)in[1]arecorrected.
简介:Thispaperprovesthat,underthehypothesisg(t,0,0)≡0andsomenaturalassumptions,thegeneratorgofabackwardstochasticdifferentialequationcanbeuniquelydeterminedbythecorrespondingg-expectationswithallterminalconditions.ThemainresultofthispaperalsoconfirmsandextendsPengShige'sconjecture.